Fmoc-POAC: [(9-Fluorenylmethyloxycarbonyl)-2, 2, 5, 5-tetramethylpyrrolidine-N-oxyl-3-amino-4-carboxylic Acid]: A Novel Protected Spin Labeled β-Amino Acid for Peptide and Protein Chemistry

The stable free radical 2, 2, 6, 6-tetramethylpiperidine-N-oxyl-4-amino-4-carboxylic acid (TOAC) is the only spin labeled amino acid that has been used to date to successfully label peptide sequences for structural studies. However, severe difficulty in coupling the subsequent amino acid has been th...

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